63e88f80
 Hu Chunming
提交三方库
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// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
// (C) Copyright 2003-2007 Jonathan Turkanis
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
// See http://www.boost.org/libs/iostreams for documentation.
#ifndef BOOST_IOSTREAMS_PIPABLE_HPP_INCLUDED
#define BOOST_IOSTREAMS_PIPABLE_HPP_INCLUDED
#if defined(_MSC_VER)
# pragma once
#endif
#include <boost/config.hpp> // BOOST_MSVC.
#include <boost/detail/workaround.hpp>
#include <boost/iostreams/detail/template_params.hpp>
#include <boost/iostreams/traits.hpp>
#include <boost/mpl/bool.hpp>
#include <boost/preprocessor/punctuation/comma_if.hpp>
#include <boost/preprocessor/repetition/enum_params.hpp>
#include <boost/static_assert.hpp>
#define BOOST_IOSTREAMS_PIPABLE(filter, arity) \
template< BOOST_PP_ENUM_PARAMS(arity, typename T) \
BOOST_PP_COMMA_IF(arity) typename Component> \
::boost::iostreams::pipeline< \
::boost::iostreams::detail::pipeline_segment< \
filter BOOST_IOSTREAMS_TEMPLATE_ARGS(arity, T) \
>, \
Component \
> operator|( const filter BOOST_IOSTREAMS_TEMPLATE_ARGS(arity, T)& f, \
const Component& c ) \
{ \
typedef ::boost::iostreams::detail::pipeline_segment< \
filter BOOST_IOSTREAMS_TEMPLATE_ARGS(arity, T) \
> segment; \
return ::boost::iostreams::pipeline<segment, Component> \
(segment(f), c); \
} \
/**/
namespace boost { namespace iostreams {
template<typename Pipeline, typename Component>
struct pipeline;
namespace detail {
#if BOOST_WORKAROUND(BOOST_BORLANDC, < 0x600)
template<typename T>
struct is_pipeline : mpl::false_ { };
template<typename Pipeline, typename Component>
struct is_pipeline< pipeline<Pipeline, Component> > : mpl::true_ { };
#endif
template<typename Component>
class pipeline_segment
{
public:
pipeline_segment(const Component& component)
: component_(component)
{ }
template<typename Fn>
void for_each(Fn fn) const { fn(component_); }
template<typename Chain>
void push(Chain& chn) const { chn.push(component_); }
private:
pipeline_segment operator=(const pipeline_segment&);
const Component& component_;
};
} // End namespace detail.
//------------------Definition of Pipeline------------------------------------//
template<typename Pipeline, typename Component>
struct pipeline : Pipeline {
typedef Pipeline pipeline_type;
typedef Component component_type;
pipeline(const Pipeline& p, const Component& component)
: Pipeline(p), component_(component)
{ }
template<typename Fn>
void for_each(Fn fn) const
{
Pipeline::for_each(fn);
fn(component_);
}
template<typename Chain>
void push(Chain& chn) const
{
Pipeline::push(chn);
chn.push(component_);
}
const Pipeline& tail() const { return *this; }
const Component& head() const { return component_; }
private:
pipeline operator=(const pipeline&);
const Component& component_;
};
template<typename Pipeline, typename Filter, typename Component>
pipeline<pipeline<Pipeline, Filter>, Component>
operator|(const pipeline<Pipeline, Filter>& p, const Component& cmp)
{
BOOST_STATIC_ASSERT(is_filter<Filter>::value);
return pipeline<pipeline<Pipeline, Filter>, Component>(p, cmp);
}
} } // End namespaces iostreams, boost.
#endif // #ifndef BOOST_IOSTREAMS_PIPABLE_HPP_INCLUDED
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